Single Stage Multi Position Furnace
Service Manual
35
440 08 2001 02
Figure 44
Horizontal Right Installations (Dual Certified *9MPD--A2 Models
)
Supply
Air
Ex
ha
us
t
Inle
t
Vent Pipe
Vent Pipe
Grommet
Vent Fitting
& Clamps
Yellow
Plastic
Cap
Drain
Line
90
°°°°
Street Elbow
Plastic Caps
Rubber Coupling
& Clamps
5
/
8
²²²²
Hose
& Clamps
Combustion
Air Pipe
(Optional)
Air Intake
Coupling
Combustion
Blower
Pressure Switch
Hose, Transition
Pressure Switch,
Transition
3
/
4
²²²²
Hose & Clamps
Condensate Trap
& Gasket
dwg 25--23--55b
Return
Air
Plastic Cap
Transition Box
Gas Pipe
Grommet
Combustion Blower
Mounting Screws
(4)
Pressure Switch,
Blower
Pressure Switch
Hose, Blower
Some Models
have one
pressure switch
Horizontal Trap Connection
Preassemble
and insert
into furnace
“Clamp ears”
Pointed OUT
NOTE: TRAP MUST BE PRIMED
BEFORE OPERATION
2
²²²²
Section
PVC Pipe
Horizontal Right Installations - (Dual Certified *9MPD
)
(See Figure 44)
Note:
For easier installation of the drain hoses and clamps to the
condensate trap, follow the directions outlined below except do not
make any clamp connections to any of the drain stubs and hoses
until the hose routing and lengths have been determined. Remove
the condensate trap and drain hoses from the furnace and secure
the drain hoses to the drain stubs on the trap with the hose clamps
(position the clamps as shown in
Figure 44).
Install the condensate
trap/hose assembly to the furnace casing. Hook one side of the
“clamp ears” on the drain stub through the hole in the casing and
push the condensate trap into position. Secure with the two screws.
Reconnect the drain hoses to the stubs on the vent fitting and the
plastic transition and secure with the clamps.
Relocate the plastic caps and clamps on the condensate drain trap
from the vertical drain stub to the horizontal drain stubs. Secure the
clamps tightly to prevent condensate leakage.
Mount the condensate drain trap in a vertical position to the right
side of the furnace using the two screws and gasket that are pro-
vided. Note: The condensate trap will be located under the furnace
in a vertical position when the furnace is placed horizontally on the
right side. If needed, remove the hole plugs from the furnace side
panel and relocated to the open set of holes in the opposite side
panel.
NOTE: All gaskets and seals must be in place for sealed combus-
tion applications.
Remove the 90
°
street elbow and vent fitting from the combustion
blower by loosening the clamps on the vent fitting. Connect the 90
°
street elbow to the combustion blower using the rubber coupling
and clamps. Cut a 2
²
section of PVC pipe from the PVC pipe pro-
vided with the furnace. Glue the 2
²
section of PVC pipe to the 90
°
street elbow after checking the fit up. (Follow the procedures out-
lined in the
Joining Pipe and Fittings
section of this manual, page
30.) Connect the vent fitting to the end of the 2
²
section of PVC pipe
using the clamp.
NOTE: The vent fitting MUST be installed with the airflow marking
arrow pointed toward the vent pipe, with the drain stub at a 20
°
to 30
°
downward slope.
Plug the upper drain stub on the vent fitting with the yellow plastic
cap.
Remove the pressure switch hose from the upper stub on the plastic
transition box.
Relocate the plastic caps on the stubs of the plastic transition box
from the lower stubs to the upper stubs and secure tightly with the
clamps.
Route the pressure switch hose to the lower stub on the plastic tran-
sition box. Cut off excess hose and discard. Connect the pressure
switch hose to the lower stub on the plastic transition box. Ensure
that the hose is routed above the stub on the transition box so that
condensate does not collect in the hose. NOTE: Failure to correctly
install the pressure switch hose to the transition can adversely affect
the safety control operation.
Connect the
3
/
4
²
OD rubber hose with the 90
°
bend to the large drain
stub on the condensate trap and secure with a
3
/
4
²
clamp.
Route the hose to the drain stub on the bottom of the plastic transi-
tion box. Cut off excess hose and discard. Connect the hose to the
drain stub on the transition and secure with a
3
/
4
²
clamp.
Connect the
5
/
8
²
OD rubber hose with the 90
°
bend to the lower
drain stub on the vent fitting and secure with a
5
/
8
²
clamp.
